On this page
Asset Type
Manufacturer
Model
What This Guide Helps With
Repeated low-water or contamination problems caused by poor water quality, scale, debris, reservoir condition, drainage, or restricted water flow.
Step-by-Step Troubleshooting
1. Protect Sterilization Reliability
Remove the sterilizer from routine clinical use if repeated low-water conditions or heavy mineral buildup are interfering with cycle completion.
Do not continue processing loads through repeated incomplete cycles.
Expected outcome: Instruments are not processed in a sterilizer with unreliable water supply or contaminated fluid paths.
2. Confirm the Reported Condition
Determine whether the problem involves:
- Visible mineral scale
- Debris in the reservoir
- Repeated low-water indication
- Chamber not filling
- Water disappearing unusually quickly
- Cycle interruption
- Residue on chamber surfaces
Expected outcome: The condition is clearly documented.
3. Inspect Reservoir Water Level and Quality
Check the reservoir for:
- Adequate water
- Cloudiness
- Sediment
- Mineral residue
- Discoloration
- Contamination
Confirm the facility is using water appropriate for the sterilizer.
Expected outcome: The water source is acceptable or an obvious water-quality problem is identified.
4. Inspect the Reservoir
With the unit safe and cool, inspect accessible reservoir surfaces for deposits, debris, or buildup.
Clean using approved practices and materials.
Expected outcome: Accessible reservoir surfaces are clean and free of loose contamination.
5. Inspect the Chamber and Drain Area
Check the chamber and accessible drain areas for:
- Scale
- Instrument debris
- Packaging material
- Standing water
- Obstruction
Remove only accessible debris using approved cleaning methods.
Expected outcome: Water and condensate pathways are visibly unobstructed.
6. Inspect Accessible Fill Path Components
Inspect accessible outlets, screens, hoses, and fittings for mineral deposits or debris.
Do not probe internal valves or dismantle plumbing outside authorized service procedures.
Expected outcome: No visible external restriction remains in the fill path.
7. Check for Water Loss
Inspect around the sterilizer for evidence of:
- Reservoir leakage
- Door leakage
- Plumbing leakage
- Repeated relief discharge
- Water collecting beneath the unit
Expected outcome: Unexpected water loss is either identified or ruled out.
8. Refill With Appropriate Water and Run an Empty Test
After cleaning accessible areas, refill the reservoir appropriately and run an approved empty cycle.
Observe fill behavior and whether the low-water condition returns.
Expected outcome: The chamber fills and the cycle progresses normally. If the problem does not recur, troubleshooting can stop after complete verification.
9. Evaluate Recurrence
If scale returns quickly or low-water indications recur, document:
- Water source
- Frequency of occurrence
- Visible buildup
- Fill performance
- Leakage
- Cycle interruptions
Coordinate with the responsible department if facility water handling or cleaning practices are contributing.
Expected outcome: Recurrent environmental or maintenance contributors are identified or ruled out.
10. Escalate Repeated Low-Water or Internal Restriction
If the reservoir is adequately filled and accessible areas are clean but low-water conditions continue, remove the sterilizer from service.
Expected outcome: The unit is escalated before an internal flow, sensing, or plumbing problem causes repeated failed cycles.
If the Problem Persists
Common external causes such as poor water quality, visible scale, debris, reservoir condition, leakage, and accessible flow restrictions have been ruled out. Remaining causes may involve internal valves, tubing, sensors, fill components, drainage assemblies, heating systems, or control circuitry.
The sterilizer should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using appropriate Midmark documentation and approved test equipment
- Cleaned, repaired, or configured only by qualified personnel
Return-to-service testing should verify normal filling, complete cycle progression, and absence of recurring low-water conditions.
Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
Repeatedly topping off the reservoir without identifying why low-water conditions recur can mask a leak, restriction, or water-quality problem.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Staff reported repeated low-water conditions on the M11 despite routinely filling the reservoir."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found significant mineral scale and debris in accessible reservoir and drain areas restricting normal water movement."
Resolution
What action was taken.
Example:
"Accessible deposits were removed using approved cleaning practices, appropriate water was added, and the sterilizer completed a full test cycle without recurrence."
Helpful Details to Include (If Known)
- Reservoir level
- Water source
- Water appearance
- Scale location
- Debris found
- Drain condition
- Evidence of leakage
- Fill behavior
- Low-water recurrence
- Test-cycle result
- Final device status
- Reservoir level
- Water source
- Water appearance
- Scale location
- Debris found
- Drain condition
- Evidence of leakage
- Fill behavior
- Low-water recurrence
- Test-cycle result
- Final device status
Final Thought
Water quality and cleanliness should be verified before internal failure is assumed; persistent low-water conditions require escalation when external causes have been eliminated.
That is successful troubleshooting.